Dont really think that theres much you can do to be honest, the Gforce series of cards are not qualified to run with maya (although the ones iv'e used never seem to have a problem).
You could try using the hardware render buffer to render the particles as i've heard that this can sometimes get round the problem, have a search in the help files for the hardwarerender buffer and give it a try.
"No pressure, no diamonds" Thomas Carlyle